Atomic submarine: warship that travels and fights under water.
Aft diving plane: operating like a helm to maintain vertical position.
Stem propulsion system: steam-driven apparatus that propels a submarine.
Escape hatch: sealed chamber between the air and the water used for passing between the interior and exterior of a submarine in emergencies.
Access hatch: sealed chamber between the air and the water used for mooring.
Refectory: room reserved for personnel.
Antenna: apparatus that receives waves.
Snorkel: tube used to expel gases and take in fresh air.
Periscope: optical device used to see an object hidden by an obstacle.
Turret: guns' location.
Torpedo room: place where torpedoes are stored.
Guidance sonar: submarine radar based on the reflection of sound waves. It is used for navigation.
Ballast: tanks that are filled with water to dive and emptied to climb.
Battery: device that generates electric current.
Torpedo: explosive-filled warhead used under water.
Radio antenna: apparatus that receives radio waves.
Nuclear reactor: device in which nuclear reactions take place.
Auxiliary electric motor: emergency electric engine.
Rudder: small wing.
Lower rudder: apparatus used to turn a boat.
Propeller: two- or three-bladed propulsion apparatus.